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The purpose of adding cryolite is
  • a)
    to increase the electrical conductivity of pure aluminium
  • b)
    to lower the melting point of Al2O3
  • c)
    to remove the impurities as slag
  • d)
    to increase the Al% in the yield
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The purpose of adding cryolite isa)to increase the electrical conducti...
Cryolite is used in the electrolysis of aluminium oxide. The mixture of cryolite and aluminium oxide has a lower melting point than pure aluminium oxide. This means a lower amount of energy is required to establish effective conditions for electrolysis and thus makes it more cost effective.
Fluorspar is added along with cryolite as electrolytes with Gibbsite fluorspar is responsible for increasing the conductivity as well as the fluidity of Al whereas cryolite lowers the melting point of Al2O3
Hence the correct answers are A and B.
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Most Upvoted Answer
The purpose of adding cryolite isa)to increase the electrical conducti...
Cryolite is used in the electrolysis of aluminium oxide. The mixture of cryolite and aluminium oxide has a lower melting point than pure aluminium oxide. This means a lower amount of energy is required to establish effective conditions for electrolysis and thus makes it more cost effective.
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Community Answer
The purpose of adding cryolite isa)to increase the electrical conducti...
Fluorspar is added along with cryolite as electrolytes with Gibbsite fluorspar is responsible for increasing the conductivity as well as the fluidity of Al whereas cryolite lowers the melting point of Al2O3 to about 950 celsius
hence answer should be b
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